Vulnerability Intelligence Report
cross-origin Digest auth state leak
CVE-2026-11856
Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest** authentication and then changing the origin to a different one (`hostB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Authorization:` header field meant for `hostA`, to `hostB`.
No Active Exploit Signals
CVSS Base Score
9.8
CRITICAL
Exploitability:3.9
Impact Score:5.9
EPSS Probability:0.69%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-294 ↗Authentication Bypass by Capture-replay
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| curl | curl | 7.10.6 < 8.14.2 (affected), 8.15.0 < 8.16.1 (affected), 8.17.0 < 8.20.1 (affected) |
| curl | curl | 334d78cd18a7310144383929bdcef34ffbf6159b < 5c6b4880357ab3e72967c1c45cae0f96ffabc535 (affected) |
| curl | curl | 8.20.0 (affected), 8.19.0 (affected), 8.18.0 (affected), 8.17.0 (affected), 8.16.0 (affected), 8.15.0 (affected), 8.14.1 (affected), 8.14.0 (affected), 8.13.0 (affected), 8.12.1 (affected), 8.12.0 (affected), 8.11.1 (affected), 8.11.0 (affected), 8.10.1 (affected), 8.10.0 (affected), 8.9.1 (affected), 8.9.0 (affected), 8.8.0 (affected), 8.7.1 (affected), 8.7.0 (affected), 8.6.0 (affected), 8.5.0 (affected), 8.4.0 (affected), 8.3.0 (affected), 8.2.1 (affected), 8.2.0 (affected), 8.1.2 (affected), 8.1.1 (affected), 8.1.0 (affected), 8.0.1 (affected), 8.0.0 (affected), 7.88.1 (affected), 7.88.0 (affected), 7.87.0 (affected), 7.86.0 (affected), 7.85.0 (affected), 7.84.0 (affected), 7.83.1 (affected), 7.83.0 (affected), 7.82.0 (affected), 7.81.0 (affected), 7.80.0 (affected), 7.79.1 (affected), 7.79.0 (affected), 7.78.0 (affected), 7.77.0 (affected), 7.76.1 (affected), 7.76.0 (affected), 7.75.0 (affected), 7.74.0 (affected), 7.73.0 (affected), 7.72.0 (affected), 7.71.1 (affected), 7.71.0 (affected), 7.70.0 (affected), 7.69.1 (affected), 7.69.0 (affected), 7.68.0 (affected), 7.67.0 (affected), 7.66.0 (affected), 7.65.3 (affected), 7.65.2 (affected), 7.65.1 (affected), 7.65.0 (affected), 7.64.1 (affected), 7.64.0 (affected), 7.63.0 (affected), 7.62.0 (affected), 7.61.1 (affected), 7.61.0 (affected), 7.60.0 (affected), 7.59.0 (affected), 7.58.0 (affected), 7.57.0 (affected), 7.56.1 (affected), 7.56.0 (affected), 7.55.1 (affected), 7.55.0 (affected), 7.54.1 (affected), 7.54.0 (affected), 7.53.1 (affected), 7.53.0 (affected), 7.52.1 (affected), 7.52.0 (affected), 7.51.0 (affected), 7.50.3 (affected), 7.50.2 (affected), 7.50.1 (affected), 7.50.0 (affected), 7.49.1 (affected), 7.49.0 (affected), 7.48.0 (affected), 7.47.1 (affected), 7.47.0 (affected), 7.46.0 (affected), 7.45.0 (affected), 7.44.0 (affected), 7.43.0 (affected), 7.42.1 (affected), 7.42.0 (affected), 7.41.0 (affected), 7.40.0 (affected), 7.39.0 (affected), 7.38.0 (affected), 7.37.1 (affected), 7.37.0 (affected), 7.36.0 (affected), 7.35.0 (affected), 7.34.0 (affected), 7.33.0 (affected), 7.32.0 (affected), 7.31.0 (affected), 7.30.0 (affected), 7.29.0 (affected), 7.28.1 (affected), 7.28.0 (affected), 7.27.0 (affected), 7.26.0 (affected), 7.25.0 (affected), 7.24.0 (affected), 7.23.1 (affected), 7.23.0 (affected), 7.22.0 (affected), 7.21.7 (affected), 7.21.6 (affected), 7.21.5 (affected), 7.21.4 (affected), 7.21.3 (affected), 7.21.2 (affected), 7.21.1 (affected), 7.21.0 (affected), 7.20.1 (affected), 7.20.0 (affected), 7.19.7 (affected), 7.19.6 (affected), 7.19.5 (affected), 7.19.4 (affected), 7.19.3 (affected), 7.19.2 (affected), 7.19.1 (affected), 7.19.0 (affected), 7.18.2 (affected), 7.18.1 (affected), 7.18.0 (affected), 7.17.1 (affected), 7.17.0 (affected), 7.16.4 (affected), 7.16.3 (affected), 7.16.2 (affected), 7.16.1 (affected), 7.16.0 (affected), 7.15.5 (affected), 7.15.4 (affected), 7.15.3 (affected), 7.15.2 (affected), 7.15.1 (affected), 7.15.0 (affected), 7.14.1 (affected), 7.14.0 (affected), 7.13.2 (affected), 7.13.1 (affected), 7.13.0 (affected), 7.12.3 (affected), 7.12.2 (affected), 7.12.1 (affected), 7.12.0 (affected), 7.11.2 (affected), 7.11.1 (affected), 7.11.0 (affected), 7.10.8 (affected), 7.10.7 (affected), 7.10.6 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.688%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | curl · Open Source · Sweden |
| Reserved | 2026-06-10T08:59:16 |
| Published | 2026-07-03T06:13:31 |
| Last Updated | 2026-09-15T06:02:42 |
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